- MS Office's default file formats are open standards with open source libraries/ reference implementations - MS Office (both desktop and web app) can handle ODF very well nowadays.
At least for small business and home users, Google docs has become increasingly dominant with surprisingly little concern for long-term document accessibility. For example, Google Drive will only sync down links to Google doc files on desktop. Aside from manually exporting every single document you have in the preferred format, there is no way to get your documents for backup/archival purposes, and good luck switching to another service/software. It would be nice to see a little interest in standards/compatibility for google docs now that so many businesses use it.